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How to validate/group a Checkbox along with a CheckboxList in ASP.NET?

My Web form has two choices for the User, and the choices are mutually exclusive. However, Option 2 (being awake), allows for more than one checkbox. How can I utilize a GroupName to these two controls to enforce that Option 1 is not checked if one of the Option 2 listitems is selected?
Option 1: sleep
Option 2: drive and/or sing and/or eat

<tr>
<td><asp:label id="LabelSleep" Runat="server">Option 1:</asp:label></td>
<td><asp:checkbox id="CheckBoxsleep" runat="server" Text="Sleep"</asp:checkbox></td>
</tr>
<tr>
<td><asp:label id="LabelAwake" Runat="server">Option 2:</asp:label></td>
<td><asp:CheckBoxList id="CheckBoxList1" runat="server"  RepeatDirection="Horizontal">
<asp:ListItem Value="1">Drive</asp:ListItem>
<asp:ListItem Value="1">Sing</asp:ListItem>
<asp:ListItem Value="1">Eat</asp:ListItem>
</asp:CheckBoxList></td>
</tr>
ASKER CERTIFIED SOLUTION
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mmarinov
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SOLUTION
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waterhidden
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ASKER

The two posted answers have helped me, however I'm still looking over waterhidden's answer.  The below code has proven to be a sucessful server-side validation solution, however ideally I want to have a client-side custom validator.

'Validate the User's Option choice. Ideally, this should be a client-side custom validator.
                If CheckBoxList1.Items(0).Selected Or CheckBoxList1.Items(1).Selected Or CheckBoxList1.Items(2).Selected Then
                    If CheckBoxValidateOnly.Checked Then
                        Throw New ArgumentException("Both Options are selected. Please select only Option 1 or Option 2 for your Submission.")
                    End If
                Else
                    If Not CheckBoxValidateOnly.Checked Then
                        Throw New ArgumentException("No Option selected. Please select either Option 1 or Option 2 for your Submission.")
                    End If
                End If